Keyboard



FIG. 1 is a perspective view of a keyboard showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front end view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a right side view thereof.

Broken lines are used in the drawings to illustrate environment. The features illustrated in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 